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(No Model.) 2 Sheets-Sheet 1.

R. T. McDONALD & J. CAIN. ELBGTRIG ARG LAMP HEAD LIGHT.

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' R. T. MCDONALD & J. GAIN.

ELEGTRIG ARC LAMP HEAD LIGHT.

No. 415,252. Patented Nov. 19, 1889.

Z w .dttorney UNITED STATES PATENT OFFICE.

RANALD T. MCDONALD AND JACOB CAIN, OF FORT WAYNE, INDIANA, AS-

SIGNORS TO THE FORT \VAYNE ELECTRIC LIGHT COMPANY, OF SAME PLACE.

ELECTRlC-ARC-LAMP HEAD-LIGHT.

SPECIFICATION forming" part of Letters Patent No. 415,252, dated November 19, 1889.

Application filed August 14, 1885. Renewed May 6, 1889. Serial No. 309,801. (No model.)

To all whom it may concern:

Be it known that we, RANALD T. MCDON- ALD and JACOB CAIN, citizens of the United States, residing at Fort \Vayne, in the county ofAllen, in the State of Indiana,have j ointlyinvented certain new and useful Improvements in Electric-Arc-Lamp Head-Lights; and we do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same,

reference being had to the accompanying drawings, which form part of this specification.

Our invention is of an improved adjustable electric-arc-lamp head-light.

In the drawings, Figure 1 is a front View of the head-light. Fig. 2 is a side view of the same. Fig. 3 is a detail of the lamp-connections, and Fig. 4: is a detail of the Windlass.

Identical parts are denoted by the same letters in all the figures.

R is the reflector.

At C and C are holes, through which the carbons enter from above and below. Two sleeves S and S, rigidly connected with the reflector, slide up and down on two standards 8 and s. A cable A A A is attached to the arm-connections of these sleeves and carried under the pulley p and over the pulleys p, 13 and ga A block on pulley p is made fast to another cable, which passes by the pulleys 13*, 19 p and p to one section of the Windlass \V, by turning which the reflector R is raised or lowered to adjust its focus to the voltaic are between the carbons. The cable II H H H has a turn around the drum D at the base of the head-light and another around the other section of the Windlass W, by means of which the head-light is turned upon its hollow central axis.

At Z is a supporting-cable which limits the drop of the reflector R.

At Fig. 3 is shown the wooden cross-piece which supports the wire connections of the lamp. B is the central aperture below the hollow axis, through which the cable A passes from p to f.

At 8]) and 8 are two brass springs electrically connected with the binding-posts w and w, respectively, and which press upon two corresponding circular brass tracks on the under side of the drum D, insulated from each other, and through which the connections of the lamp are made.

At sw is a switch by which the lamp-circuit may be opened or closed.

The regulating mechanism of the lamp 1s in L.

The Windlass WV has two separate aXles one for the cable A A A, the other for the cable H H H H. Each axle has a wheel and radial arms, and the axle carrying the drumcable H H H H has also a crank c, which has a divisible arm, as shown at the sections 0' and c in Fig. 4, which may be adjusted in length by bolts through the holes shown in the crank in Fig. 1.

The form of construction here shown is designed specially for use on a steamboat. To one familiar with the art modifications 0t it embracing the principles of our invention and adapting it to other uses will readily suggest themselves.

\Ve are aware that electric head-lights for locomotives have been patented with a capacity for vertical adjustment to properly regulate the focus, and for a lateral adj ustment, both produced by means and connec tion which are rigid throughout, and such 1nventions we disclaim, as they would be unsuitable for head-lights for vessels, particularly steamboats, where a radial adjustment of the head-light is essential, particularly at landingsand where the means for producing the several adjustments must be flexible.

lVe claim as our invention- A11 arc-lamp head-light consisting of a main casing, a reflector 'R within the same and mounted on the standards 8 s, the cable A A, passing over the pulleys p 19 for raising and lowering the said reflector and secured to one portion of the sectional Windlass Y, the carbons C, extending through openings in said reflector for the purpose mentioned, a drum D at the lower portion of the main casing, a continuous cable around said drum and extending to the other portion of said sectional Windlass, by means of which the main casing may be partially revolved, so that the light may be thrown in the path of a circle, the two spring-contacts s19 Sp, connected with the binding-posts w w, respectively, and bearing against the tracks on the bottom of the drum D, and a switch 310, interposed in the circuit, by which the circuit may be opened or closed, substantially as set forth.

In testimony whereof we hereto subscribe our names, in the presence of two witnesses, this 12th day of August, 1885.

RANALD T. MCDONALD.

JACOB CAIN.

Witnesses:

BAYLESS SWIFT, SAMUEL L. MORRIS. 

